· Stable Reference –0.047 Volts vs. SCE
· Internal Filling: Silver chloride and saturated potassium chloride.
· Easily disposable, no mercury.
· Replaceable tip.
· Always in stock. Made in USA.
The silver/silver chloride or Ag/AgCL reference electrode is many electrochemists' reference electrode of choice. It is widely used, stable, non toxic and quite robust. The silver-silver chloride electrode simplicity and fundamental ruggedness makes it a good candidate for many commercial applications where the electrochemical potential has to been measured or controlled. It is mainly used with saturated potassium chloride (KCL) electrolyte, but can be also filled with lower concentrations such as 1 M KCL and even directly in seawater.
The Silver-Silver Chloride electrode has been shown to possess superior characteristics to that of unchlorided silver electrodes when used for recording low level AC and DC potentials. Chloridized silver electrodes present less low frequency "noise" than either gold or silver electrodes. The Koslow Silver-Silver Chloride electrodes are constructed of pure silver and then chloridized to provide the stability and low noise characteristics. The Silver/Silver Chloride potential is approximately +0.199 Volts vs. Normal Hydrogen Electrode (NHE) or -0.047 Volts vs. Saturated Calomel Reference Electrode (SCE)
Body Length: 4" ( 101 mm)
Body OD: 3/8" (9 mm)
Electrode neck OD 1/8 (4 mm)
16" cable, banana plug connector
More Facts: Koslow reference electrodes use a saturated KCL solution with an excess of KCL crystals. These can sometimes be seen on the bottom of the electrode. The extra KCL dissolves into the electrolyte as the potassium and chloride ions diffuse out through the liquid junction in normal use. This extra buffer of KCL extends the time before the reference cell starts to drift due to the depletion of chloride ions in the electrolyte.
The Tip: Electro porous KT Glass serves as the ionicly conducting electrical pathway between the inside of the reference electrode and the bulk of your cell. The Electro-porous KT Glass frit (about 1/8" long) is attached to the glass tube by 'heat shrinkable' Teflon sleeve. The Glass has a low electrical resistance (under 10 kili Ohm for the common filling solutions) and a modest leak rate. The electrical resistance of the reference electrode 'frit' is an important factor in determining the stability and speed of your potentiostat in actual use. When changing KT Glass frits, the heat-shrink tubing should be trimmed flush with the end of the KT Glass frit to prevent capturing of air bubbles.
Aging: UV light decomposes AgCL to give silver(0) which gives the electrode a black appearance. Normal fluorescent lights shouldn’t be a problem, but don't store your electrodes in direct sun light. Light protected amber glass storage bottles are recommended to store electrode with frit in KCL filling solution. Saturated solutions of KCL have the advantage that the concentration is reproducible even if the temperature changes (if solid salt is present) and are immune to the effects of water.
Set your self up with electrode refill solutions & spare tips too.
Order from the blue accessories box at left.